ya I mean just like a treaty right, those always make everything better at that point.
The point is at some time there is going to be a conflict and you cant just pull out a peice of paper and expect both parties to go " oh yeah, silly me, i forgot about that" and the problem magcally goes away. And to say that there will not be any problems is to play ignorant. Some of the best marriges end in divorce.
Now I am not wishing the worse for you, but by preparing for the worse, we can usually end up surviving it. It is just that a partnership is in my opinion already starting out in a pretty bad spot and there is not a long fall to the worse that can happen.